There was mention in beta on one of the early live letters that at some point you will be able to take your chocobo into battle with you in dungeons. Maybe with the apparent diversity of jobs etc that retainers appear to have and the ability to level them like a normal player with current jobs ( pugilist as shown lvl 50) as well as gear them and tamper with their attributes as shown in video tab. Maybe it will be their plan to have our retainers join us in dungeon battles instead of chocobo's!!!! This would be quite interesting and seems a lot more viable with what appears in the video.